1 /* 2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem 3 * 4 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) 5 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) 6 * Copyright (C) 2002,2003 NEC Corporation 7 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com) 8 * Copyright (C) 2003-2005 Hewlett Packard 9 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) 10 * Copyright (C) 2005 Intel Corporation 11 * 12 * All rights reserved. 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2 of the License, or (at 17 * your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, but 20 * WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 22 * NON INFRINGEMENT. See the GNU General Public License for more 23 * details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, write to the Free Software 27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 28 * 29 * Send feedback to <kristen.c.accardi@intel.com> 30 * 31 */ 32 33 /* 34 * Lifetime rules for pci_dev: 35 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot() 36 * when the bridge is scanned and it loses a refcount when the bridge 37 * is removed. 38 * - When a P2P bridge is present, we elevate the refcount on the subordinate 39 * bus. It loses the refcount when the the driver unloads. 40 */ 41 42 #include <linux/init.h> 43 #include <linux/module.h> 44 45 #include <linux/kernel.h> 46 #include <linux/pci.h> 47 #include <linux/pci_hotplug.h> 48 #include <linux/pci-acpi.h> 49 #include <linux/pm_runtime.h> 50 #include <linux/mutex.h> 51 #include <linux/slab.h> 52 #include <linux/acpi.h> 53 54 #include "../pci.h" 55 #include "acpiphp.h" 56 57 static LIST_HEAD(bridge_list); 58 static DEFINE_MUTEX(bridge_mutex); 59 static DEFINE_MUTEX(acpiphp_context_lock); 60 61 #define MY_NAME "acpiphp_glue" 62 63 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data); 64 static void acpiphp_sanitize_bus(struct pci_bus *bus); 65 static void acpiphp_set_hpp_values(struct pci_bus *bus); 66 static void hotplug_event(acpi_handle handle, u32 type, void *data); 67 static void free_bridge(struct kref *kref); 68 69 static void acpiphp_context_handler(acpi_handle handle, void *context) 70 { 71 /* Intentionally empty. */ 72 } 73 74 /** 75 * acpiphp_init_context - Create hotplug context and grab a reference to it. 76 * @handle: ACPI object handle to create the context for. 77 * 78 * Call under acpiphp_context_lock. 79 */ 80 static struct acpiphp_context *acpiphp_init_context(acpi_handle handle) 81 { 82 struct acpiphp_context *context; 83 acpi_status status; 84 85 context = kzalloc(sizeof(*context), GFP_KERNEL); 86 if (!context) 87 return NULL; 88 89 context->handle = handle; 90 context->refcount = 1; 91 status = acpi_attach_data(handle, acpiphp_context_handler, context); 92 if (ACPI_FAILURE(status)) { 93 kfree(context); 94 return NULL; 95 } 96 return context; 97 } 98 99 /** 100 * acpiphp_get_context - Get hotplug context and grab a reference to it. 101 * @handle: ACPI object handle to get the context for. 102 * 103 * Call under acpiphp_context_lock. 104 */ 105 static struct acpiphp_context *acpiphp_get_context(acpi_handle handle) 106 { 107 struct acpiphp_context *context = NULL; 108 acpi_status status; 109 void *data; 110 111 status = acpi_get_data(handle, acpiphp_context_handler, &data); 112 if (ACPI_SUCCESS(status)) { 113 context = data; 114 context->refcount++; 115 } 116 return context; 117 } 118 119 /** 120 * acpiphp_put_context - Drop a reference to ACPI hotplug context. 121 * @handle: ACPI object handle to put the context for. 122 * 123 * The context object is removed if there are no more references to it. 124 * 125 * Call under acpiphp_context_lock. 126 */ 127 static void acpiphp_put_context(struct acpiphp_context *context) 128 { 129 if (--context->refcount) 130 return; 131 132 WARN_ON(context->bridge); 133 acpi_detach_data(context->handle, acpiphp_context_handler); 134 kfree(context); 135 } 136 137 static inline void get_bridge(struct acpiphp_bridge *bridge) 138 { 139 kref_get(&bridge->ref); 140 } 141 142 static inline void put_bridge(struct acpiphp_bridge *bridge) 143 { 144 kref_put(&bridge->ref, free_bridge); 145 } 146 147 static void free_bridge(struct kref *kref) 148 { 149 struct acpiphp_context *context; 150 struct acpiphp_bridge *bridge; 151 struct acpiphp_slot *slot, *next; 152 struct acpiphp_func *func, *tmp; 153 154 mutex_lock(&acpiphp_context_lock); 155 156 bridge = container_of(kref, struct acpiphp_bridge, ref); 157 158 list_for_each_entry_safe(slot, next, &bridge->slots, node) { 159 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) 160 acpiphp_put_context(func_to_context(func)); 161 162 kfree(slot); 163 } 164 165 context = bridge->context; 166 /* Root bridges will not have hotplug context. */ 167 if (context) { 168 /* Release the reference taken by acpiphp_enumerate_slots(). */ 169 put_bridge(context->func.parent); 170 context->bridge = NULL; 171 acpiphp_put_context(context); 172 } 173 174 put_device(&bridge->pci_bus->dev); 175 pci_dev_put(bridge->pci_dev); 176 kfree(bridge); 177 178 mutex_unlock(&acpiphp_context_lock); 179 } 180 181 /* 182 * the _DCK method can do funny things... and sometimes not 183 * hah-hah funny. 184 * 185 * TBD - figure out a way to only call fixups for 186 * systems that require them. 187 */ 188 static void post_dock_fixups(acpi_handle not_used, u32 event, void *data) 189 { 190 struct acpiphp_context *context = data; 191 struct pci_bus *bus = context->func.slot->bus; 192 u32 buses; 193 194 if (!bus->self) 195 return; 196 197 /* fixup bad _DCK function that rewrites 198 * secondary bridge on slot 199 */ 200 pci_read_config_dword(bus->self, 201 PCI_PRIMARY_BUS, 202 &buses); 203 204 if (((buses >> 8) & 0xff) != bus->busn_res.start) { 205 buses = (buses & 0xff000000) 206 | ((unsigned int)(bus->primary) << 0) 207 | ((unsigned int)(bus->busn_res.start) << 8) 208 | ((unsigned int)(bus->busn_res.end) << 16); 209 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); 210 } 211 } 212 213 214 static const struct acpi_dock_ops acpiphp_dock_ops = { 215 .fixup = post_dock_fixups, 216 .handler = hotplug_event, 217 }; 218 219 /* Check whether the PCI device is managed by native PCIe hotplug driver */ 220 static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) 221 { 222 u32 reg32; 223 acpi_handle tmp; 224 struct acpi_pci_root *root; 225 226 /* Check whether the PCIe port supports native PCIe hotplug */ 227 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32)) 228 return false; 229 if (!(reg32 & PCI_EXP_SLTCAP_HPC)) 230 return false; 231 232 /* 233 * Check whether native PCIe hotplug has been enabled for 234 * this PCIe hierarchy. 235 */ 236 tmp = acpi_find_root_bridge_handle(pdev); 237 if (!tmp) 238 return false; 239 root = acpi_pci_find_root(tmp); 240 if (!root) 241 return false; 242 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) 243 return false; 244 245 return true; 246 } 247 248 static void acpiphp_dock_init(void *data) 249 { 250 struct acpiphp_context *context = data; 251 252 get_bridge(context->func.parent); 253 } 254 255 static void acpiphp_dock_release(void *data) 256 { 257 struct acpiphp_context *context = data; 258 259 put_bridge(context->func.parent); 260 } 261 262 /* callback routine to register each ACPI PCI slot object */ 263 static acpi_status register_slot(acpi_handle handle, u32 lvl, void *data, 264 void **rv) 265 { 266 struct acpiphp_bridge *bridge = data; 267 struct acpiphp_context *context; 268 struct acpiphp_slot *slot; 269 struct acpiphp_func *newfunc; 270 acpi_status status = AE_OK; 271 unsigned long long adr; 272 int device, function; 273 struct pci_bus *pbus = bridge->pci_bus; 274 struct pci_dev *pdev = bridge->pci_dev; 275 u32 val; 276 277 if (pdev && device_is_managed_by_native_pciehp(pdev)) 278 return AE_OK; 279 280 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); 281 if (ACPI_FAILURE(status)) { 282 acpi_handle_warn(handle, "can't evaluate _ADR (%#x)\n", status); 283 return AE_OK; 284 } 285 286 device = (adr >> 16) & 0xffff; 287 function = adr & 0xffff; 288 289 mutex_lock(&acpiphp_context_lock); 290 context = acpiphp_init_context(handle); 291 if (!context) { 292 mutex_unlock(&acpiphp_context_lock); 293 acpi_handle_err(handle, "No hotplug context\n"); 294 return AE_NOT_EXIST; 295 } 296 newfunc = &context->func; 297 newfunc->function = function; 298 newfunc->parent = bridge; 299 mutex_unlock(&acpiphp_context_lock); 300 301 if (acpi_has_method(handle, "_EJ0")) 302 newfunc->flags = FUNC_HAS_EJ0; 303 304 if (acpi_has_method(handle, "_STA")) 305 newfunc->flags |= FUNC_HAS_STA; 306 307 if (acpi_has_method(handle, "_DCK")) 308 newfunc->flags |= FUNC_HAS_DCK; 309 310 /* search for objects that share the same slot */ 311 list_for_each_entry(slot, &bridge->slots, node) 312 if (slot->device == device) 313 goto slot_found; 314 315 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); 316 if (!slot) { 317 status = AE_NO_MEMORY; 318 goto err; 319 } 320 321 slot->bus = bridge->pci_bus; 322 slot->device = device; 323 INIT_LIST_HEAD(&slot->funcs); 324 mutex_init(&slot->crit_sect); 325 326 list_add_tail(&slot->node, &bridge->slots); 327 328 /* Register slots for ejectable funtions only. */ 329 if (acpi_pci_check_ejectable(pbus, handle) || is_dock_device(handle)) { 330 unsigned long long sun; 331 int retval; 332 333 bridge->nr_slots++; 334 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); 335 if (ACPI_FAILURE(status)) 336 sun = bridge->nr_slots; 337 338 dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", 339 sun, pci_domain_nr(pbus), pbus->number, device); 340 341 retval = acpiphp_register_hotplug_slot(slot, sun); 342 if (retval) { 343 slot->slot = NULL; 344 bridge->nr_slots--; 345 if (retval == -EBUSY) 346 warn("Slot %llu already registered by another " 347 "hotplug driver\n", sun); 348 else 349 warn("acpiphp_register_hotplug_slot failed " 350 "(err code = 0x%x)\n", retval); 351 } 352 /* Even if the slot registration fails, we can still use it. */ 353 } 354 355 slot_found: 356 newfunc->slot = slot; 357 list_add_tail(&newfunc->sibling, &slot->funcs); 358 359 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), 360 &val, 60*1000)) 361 slot->flags |= SLOT_ENABLED; 362 363 if (is_dock_device(handle)) { 364 /* we don't want to call this device's _EJ0 365 * because we want the dock notify handler 366 * to call it after it calls _DCK 367 */ 368 newfunc->flags &= ~FUNC_HAS_EJ0; 369 if (register_hotplug_dock_device(handle, 370 &acpiphp_dock_ops, context, 371 acpiphp_dock_init, acpiphp_dock_release)) 372 dbg("failed to register dock device\n"); 373 } 374 375 /* install notify handler */ 376 if (!(newfunc->flags & FUNC_HAS_DCK)) { 377 status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, 378 handle_hotplug_event, 379 context); 380 if (ACPI_FAILURE(status)) 381 acpi_handle_err(handle, 382 "failed to install notify handler\n"); 383 } 384 385 return AE_OK; 386 387 err: 388 mutex_lock(&acpiphp_context_lock); 389 acpiphp_put_context(context); 390 mutex_unlock(&acpiphp_context_lock); 391 return status; 392 } 393 394 static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle) 395 { 396 struct acpiphp_context *context; 397 struct acpiphp_bridge *bridge = NULL; 398 399 mutex_lock(&acpiphp_context_lock); 400 context = acpiphp_get_context(handle); 401 if (context) { 402 bridge = context->bridge; 403 if (bridge) 404 get_bridge(bridge); 405 406 acpiphp_put_context(context); 407 } 408 mutex_unlock(&acpiphp_context_lock); 409 return bridge; 410 } 411 412 static void cleanup_bridge(struct acpiphp_bridge *bridge) 413 { 414 struct acpiphp_slot *slot; 415 struct acpiphp_func *func; 416 acpi_status status; 417 418 list_for_each_entry(slot, &bridge->slots, node) { 419 list_for_each_entry(func, &slot->funcs, sibling) { 420 acpi_handle handle = func_to_handle(func); 421 422 if (is_dock_device(handle)) 423 unregister_hotplug_dock_device(handle); 424 425 if (!(func->flags & FUNC_HAS_DCK)) { 426 status = acpi_remove_notify_handler(handle, 427 ACPI_SYSTEM_NOTIFY, 428 handle_hotplug_event); 429 if (ACPI_FAILURE(status)) 430 err("failed to remove notify handler\n"); 431 } 432 } 433 if (slot->slot) 434 acpiphp_unregister_hotplug_slot(slot); 435 } 436 437 mutex_lock(&bridge_mutex); 438 list_del(&bridge->list); 439 mutex_unlock(&bridge_mutex); 440 } 441 442 /** 443 * acpiphp_max_busnr - return the highest reserved bus number under the given bus. 444 * @bus: bus to start search with 445 */ 446 static unsigned char acpiphp_max_busnr(struct pci_bus *bus) 447 { 448 struct list_head *tmp; 449 unsigned char max, n; 450 451 /* 452 * pci_bus_max_busnr will return the highest 453 * reserved busnr for all these children. 454 * that is equivalent to the bus->subordinate 455 * value. We don't want to use the parent's 456 * bus->subordinate value because it could have 457 * padding in it. 458 */ 459 max = bus->busn_res.start; 460 461 list_for_each(tmp, &bus->children) { 462 n = pci_bus_max_busnr(pci_bus_b(tmp)); 463 if (n > max) 464 max = n; 465 } 466 return max; 467 } 468 469 /** 470 * acpiphp_bus_trim - Trim device objects in an ACPI namespace subtree. 471 * @handle: ACPI device object handle to start from. 472 */ 473 static void acpiphp_bus_trim(acpi_handle handle) 474 { 475 struct acpi_device *adev = NULL; 476 477 acpi_bus_get_device(handle, &adev); 478 if (adev) 479 acpi_bus_trim(adev); 480 } 481 482 /** 483 * acpiphp_bus_add - Scan ACPI namespace subtree. 484 * @handle: ACPI object handle to start the scan from. 485 */ 486 static void acpiphp_bus_add(acpi_handle handle) 487 { 488 struct acpi_device *adev = NULL; 489 490 acpiphp_bus_trim(handle); 491 acpi_bus_scan(handle); 492 acpi_bus_get_device(handle, &adev); 493 if (adev) 494 acpi_device_set_power(adev, ACPI_STATE_D0); 495 } 496 497 static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) 498 { 499 struct acpiphp_func *func; 500 union acpi_object params[2]; 501 struct acpi_object_list arg_list; 502 503 list_for_each_entry(func, &slot->funcs, sibling) { 504 arg_list.count = 2; 505 arg_list.pointer = params; 506 params[0].type = ACPI_TYPE_INTEGER; 507 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; 508 params[1].type = ACPI_TYPE_INTEGER; 509 params[1].integer.value = 1; 510 /* _REG is optional, we don't care about if there is failure */ 511 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list, 512 NULL); 513 } 514 } 515 516 static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) 517 { 518 struct acpiphp_func *func; 519 520 /* quirk, or pcie could set it already */ 521 if (dev->is_hotplug_bridge) 522 return; 523 524 list_for_each_entry(func, &slot->funcs, sibling) { 525 if (PCI_FUNC(dev->devfn) == func->function) { 526 dev->is_hotplug_bridge = 1; 527 break; 528 } 529 } 530 } 531 532 /** 533 * enable_slot - enable, configure a slot 534 * @slot: slot to be enabled 535 * 536 * This function should be called per *physical slot*, 537 * not per each slot object in ACPI namespace. 538 */ 539 static void __ref enable_slot(struct acpiphp_slot *slot) 540 { 541 struct pci_dev *dev; 542 struct pci_bus *bus = slot->bus; 543 struct acpiphp_func *func; 544 int max, pass; 545 LIST_HEAD(add_list); 546 547 list_for_each_entry(func, &slot->funcs, sibling) 548 acpiphp_bus_add(func_to_handle(func)); 549 550 pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); 551 552 max = acpiphp_max_busnr(bus); 553 for (pass = 0; pass < 2; pass++) { 554 list_for_each_entry(dev, &bus->devices, bus_list) { 555 if (PCI_SLOT(dev->devfn) != slot->device) 556 continue; 557 558 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 559 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) { 560 max = pci_scan_bridge(bus, dev, max, pass); 561 if (pass && dev->subordinate) { 562 check_hotplug_bridge(slot, dev); 563 pcibios_resource_survey_bus(dev->subordinate); 564 __pci_bus_size_bridges(dev->subordinate, 565 &add_list); 566 } 567 } 568 } 569 } 570 571 __pci_bus_assign_resources(bus, &add_list, NULL); 572 acpiphp_sanitize_bus(bus); 573 acpiphp_set_hpp_values(bus); 574 acpiphp_set_acpi_region(slot); 575 pci_enable_bridges(bus); 576 577 list_for_each_entry(dev, &bus->devices, bus_list) { 578 /* Assume that newly added devices are powered on already. */ 579 if (!dev->is_added) 580 dev->current_state = PCI_D0; 581 } 582 583 pci_bus_add_devices(bus); 584 585 slot->flags |= SLOT_ENABLED; 586 list_for_each_entry(func, &slot->funcs, sibling) { 587 dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 588 func->function)); 589 if (!dev) { 590 /* Do not set SLOT_ENABLED flag if some funcs 591 are not added. */ 592 slot->flags &= (~SLOT_ENABLED); 593 continue; 594 } 595 } 596 } 597 598 /* return first device in slot, acquiring a reference on it */ 599 static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot) 600 { 601 struct pci_bus *bus = slot->bus; 602 struct pci_dev *dev; 603 struct pci_dev *ret = NULL; 604 605 down_read(&pci_bus_sem); 606 list_for_each_entry(dev, &bus->devices, bus_list) 607 if (PCI_SLOT(dev->devfn) == slot->device) { 608 ret = pci_dev_get(dev); 609 break; 610 } 611 up_read(&pci_bus_sem); 612 613 return ret; 614 } 615 616 /** 617 * disable_slot - disable a slot 618 * @slot: ACPI PHP slot 619 */ 620 static void disable_slot(struct acpiphp_slot *slot) 621 { 622 struct acpiphp_func *func; 623 struct pci_dev *pdev; 624 625 /* 626 * enable_slot() enumerates all functions in this device via 627 * pci_scan_slot(), whether they have associated ACPI hotplug 628 * methods (_EJ0, etc.) or not. Therefore, we remove all functions 629 * here. 630 */ 631 while ((pdev = dev_in_slot(slot))) { 632 pci_stop_and_remove_bus_device(pdev); 633 pci_dev_put(pdev); 634 } 635 636 list_for_each_entry(func, &slot->funcs, sibling) 637 acpiphp_bus_trim(func_to_handle(func)); 638 639 slot->flags &= (~SLOT_ENABLED); 640 } 641 642 643 /** 644 * get_slot_status - get ACPI slot status 645 * @slot: ACPI PHP slot 646 * 647 * If a slot has _STA for each function and if any one of them 648 * returned non-zero status, return it. 649 * 650 * If a slot doesn't have _STA and if any one of its functions' 651 * configuration space is configured, return 0x0f as a _STA. 652 * 653 * Otherwise return 0. 654 */ 655 static unsigned int get_slot_status(struct acpiphp_slot *slot) 656 { 657 unsigned long long sta = 0; 658 struct acpiphp_func *func; 659 660 list_for_each_entry(func, &slot->funcs, sibling) { 661 if (func->flags & FUNC_HAS_STA) { 662 acpi_status status; 663 664 status = acpi_evaluate_integer(func_to_handle(func), 665 "_STA", NULL, &sta); 666 if (ACPI_SUCCESS(status) && sta) 667 break; 668 } else { 669 u32 dvid; 670 671 pci_bus_read_config_dword(slot->bus, 672 PCI_DEVFN(slot->device, 673 func->function), 674 PCI_VENDOR_ID, &dvid); 675 if (dvid != 0xffffffff) { 676 sta = ACPI_STA_ALL; 677 break; 678 } 679 } 680 } 681 682 return (unsigned int)sta; 683 } 684 685 /** 686 * trim_stale_devices - remove PCI devices that are not responding. 687 * @dev: PCI device to start walking the hierarchy from. 688 */ 689 static void trim_stale_devices(struct pci_dev *dev) 690 { 691 acpi_handle handle = ACPI_HANDLE(&dev->dev); 692 struct pci_bus *bus = dev->subordinate; 693 bool alive = false; 694 695 if (handle) { 696 acpi_status status; 697 unsigned long long sta; 698 699 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 700 alive = ACPI_SUCCESS(status) && sta == ACPI_STA_ALL; 701 } 702 if (!alive) { 703 u32 v; 704 705 /* Check if the device responds. */ 706 alive = pci_bus_read_dev_vendor_id(dev->bus, dev->devfn, &v, 0); 707 } 708 if (!alive) { 709 pci_stop_and_remove_bus_device(dev); 710 if (handle) 711 acpiphp_bus_trim(handle); 712 } else if (bus) { 713 struct pci_dev *child, *tmp; 714 715 /* The device is a bridge. so check the bus below it. */ 716 pm_runtime_get_sync(&dev->dev); 717 list_for_each_entry_safe(child, tmp, &bus->devices, bus_list) 718 trim_stale_devices(child); 719 720 pm_runtime_put(&dev->dev); 721 } 722 } 723 724 /** 725 * acpiphp_check_bridge - re-enumerate devices 726 * @bridge: where to begin re-enumeration 727 * 728 * Iterate over all slots under this bridge and make sure that if a 729 * card is present they are enabled, and if not they are disabled. 730 */ 731 static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) 732 { 733 struct acpiphp_slot *slot; 734 735 list_for_each_entry(slot, &bridge->slots, node) { 736 struct pci_bus *bus = slot->bus; 737 struct pci_dev *dev, *tmp; 738 739 mutex_lock(&slot->crit_sect); 740 /* wake up all functions */ 741 if (get_slot_status(slot) == ACPI_STA_ALL) { 742 /* remove stale devices if any */ 743 list_for_each_entry_safe(dev, tmp, &bus->devices, 744 bus_list) 745 if (PCI_SLOT(dev->devfn) == slot->device) 746 trim_stale_devices(dev); 747 748 /* configure all functions */ 749 enable_slot(slot); 750 } else { 751 disable_slot(slot); 752 } 753 mutex_unlock(&slot->crit_sect); 754 } 755 } 756 757 static void acpiphp_set_hpp_values(struct pci_bus *bus) 758 { 759 struct pci_dev *dev; 760 761 list_for_each_entry(dev, &bus->devices, bus_list) 762 pci_configure_slot(dev); 763 } 764 765 /* 766 * Remove devices for which we could not assign resources, call 767 * arch specific code to fix-up the bus 768 */ 769 static void acpiphp_sanitize_bus(struct pci_bus *bus) 770 { 771 struct pci_dev *dev, *tmp; 772 int i; 773 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; 774 775 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 776 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) { 777 struct resource *res = &dev->resource[i]; 778 if ((res->flags & type_mask) && !res->start && 779 res->end) { 780 /* Could not assign a required resources 781 * for this device, remove it */ 782 pci_stop_and_remove_bus_device(dev); 783 break; 784 } 785 } 786 } 787 } 788 789 /* 790 * ACPI event handlers 791 */ 792 793 void acpiphp_check_host_bridge(acpi_handle handle) 794 { 795 struct acpiphp_bridge *bridge; 796 797 bridge = acpiphp_handle_to_bridge(handle); 798 if (bridge) { 799 acpiphp_check_bridge(bridge); 800 put_bridge(bridge); 801 } 802 } 803 804 static void hotplug_event(acpi_handle handle, u32 type, void *data) 805 { 806 struct acpiphp_context *context = data; 807 struct acpiphp_func *func = &context->func; 808 struct acpiphp_bridge *bridge; 809 char objname[64]; 810 struct acpi_buffer buffer = { .length = sizeof(objname), 811 .pointer = objname }; 812 813 mutex_lock(&acpiphp_context_lock); 814 bridge = context->bridge; 815 if (bridge) 816 get_bridge(bridge); 817 818 mutex_unlock(&acpiphp_context_lock); 819 820 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 821 822 switch (type) { 823 case ACPI_NOTIFY_BUS_CHECK: 824 /* bus re-enumerate */ 825 dbg("%s: Bus check notify on %s\n", __func__, objname); 826 dbg("%s: re-enumerating slots under %s\n", __func__, objname); 827 if (bridge) { 828 acpiphp_check_bridge(bridge); 829 } else { 830 struct acpiphp_slot *slot = func->slot; 831 832 mutex_lock(&slot->crit_sect); 833 enable_slot(slot); 834 mutex_unlock(&slot->crit_sect); 835 } 836 break; 837 838 case ACPI_NOTIFY_DEVICE_CHECK: 839 /* device check */ 840 dbg("%s: Device check notify on %s\n", __func__, objname); 841 if (bridge) 842 acpiphp_check_bridge(bridge); 843 else 844 acpiphp_check_bridge(func->parent); 845 846 break; 847 848 case ACPI_NOTIFY_EJECT_REQUEST: 849 /* request device eject */ 850 dbg("%s: Device eject notify on %s\n", __func__, objname); 851 acpiphp_disable_and_eject_slot(func->slot); 852 break; 853 } 854 855 if (bridge) 856 put_bridge(bridge); 857 } 858 859 static void hotplug_event_work(struct work_struct *work) 860 { 861 struct acpiphp_context *context; 862 struct acpi_hp_work *hp_work; 863 864 hp_work = container_of(work, struct acpi_hp_work, work); 865 context = hp_work->context; 866 acpi_scan_lock_acquire(); 867 868 hotplug_event(hp_work->handle, hp_work->type, context); 869 870 acpi_scan_lock_release(); 871 kfree(hp_work); /* allocated in handle_hotplug_event() */ 872 put_bridge(context->func.parent); 873 } 874 875 /** 876 * handle_hotplug_event - handle ACPI hotplug event 877 * @handle: Notify()'ed acpi_handle 878 * @type: Notify code 879 * @data: pointer to acpiphp_context structure 880 * 881 * Handles ACPI event notification on slots. 882 */ 883 static void handle_hotplug_event(acpi_handle handle, u32 type, void *data) 884 { 885 struct acpiphp_context *context; 886 887 switch (type) { 888 case ACPI_NOTIFY_BUS_CHECK: 889 case ACPI_NOTIFY_DEVICE_CHECK: 890 case ACPI_NOTIFY_EJECT_REQUEST: 891 break; 892 893 case ACPI_NOTIFY_DEVICE_WAKE: 894 return; 895 896 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 897 acpi_handle_err(handle, "Device cannot be configured due " 898 "to a frequency mismatch\n"); 899 return; 900 901 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 902 acpi_handle_err(handle, "Device cannot be configured due " 903 "to a bus mode mismatch\n"); 904 return; 905 906 case ACPI_NOTIFY_POWER_FAULT: 907 acpi_handle_err(handle, "Device has suffered a power fault\n"); 908 return; 909 910 default: 911 acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type); 912 return; 913 } 914 915 mutex_lock(&acpiphp_context_lock); 916 context = acpiphp_get_context(handle); 917 if (context) { 918 get_bridge(context->func.parent); 919 acpiphp_put_context(context); 920 alloc_acpi_hp_work(handle, type, context, hotplug_event_work); 921 } 922 mutex_unlock(&acpiphp_context_lock); 923 } 924 925 /* 926 * Create hotplug slots for the PCI bus. 927 * It should always return 0 to avoid skipping following notifiers. 928 */ 929 void acpiphp_enumerate_slots(struct pci_bus *bus) 930 { 931 struct acpiphp_bridge *bridge; 932 acpi_handle handle; 933 acpi_status status; 934 935 if (acpiphp_disabled) 936 return; 937 938 handle = ACPI_HANDLE(bus->bridge); 939 if (!handle) 940 return; 941 942 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); 943 if (!bridge) { 944 acpi_handle_err(handle, "No memory for bridge object\n"); 945 return; 946 } 947 948 INIT_LIST_HEAD(&bridge->slots); 949 kref_init(&bridge->ref); 950 bridge->pci_dev = pci_dev_get(bus->self); 951 bridge->pci_bus = bus; 952 953 /* 954 * Grab a ref to the subordinate PCI bus in case the bus is 955 * removed via PCI core logical hotplug. The ref pins the bus 956 * (which we access during module unload). 957 */ 958 get_device(&bus->dev); 959 960 if (!pci_is_root_bus(bridge->pci_bus)) { 961 struct acpiphp_context *context; 962 963 /* 964 * This bridge should have been registered as a hotplug function 965 * under its parent, so the context has to be there. If not, we 966 * are in deep goo. 967 */ 968 mutex_lock(&acpiphp_context_lock); 969 context = acpiphp_get_context(handle); 970 if (WARN_ON(!context)) { 971 mutex_unlock(&acpiphp_context_lock); 972 put_device(&bus->dev); 973 kfree(bridge); 974 return; 975 } 976 bridge->context = context; 977 context->bridge = bridge; 978 /* Get a reference to the parent bridge. */ 979 get_bridge(context->func.parent); 980 mutex_unlock(&acpiphp_context_lock); 981 } 982 983 /* must be added to the list prior to calling register_slot */ 984 mutex_lock(&bridge_mutex); 985 list_add(&bridge->list, &bridge_list); 986 mutex_unlock(&bridge_mutex); 987 988 /* register all slot objects under this bridge */ 989 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, 990 register_slot, NULL, bridge, NULL); 991 if (ACPI_FAILURE(status)) { 992 acpi_handle_err(handle, "failed to register slots\n"); 993 cleanup_bridge(bridge); 994 put_bridge(bridge); 995 } 996 } 997 998 /* Destroy hotplug slots associated with the PCI bus */ 999 void acpiphp_remove_slots(struct pci_bus *bus) 1000 { 1001 struct acpiphp_bridge *bridge; 1002 1003 if (acpiphp_disabled) 1004 return; 1005 1006 mutex_lock(&bridge_mutex); 1007 list_for_each_entry(bridge, &bridge_list, list) 1008 if (bridge->pci_bus == bus) { 1009 mutex_unlock(&bridge_mutex); 1010 cleanup_bridge(bridge); 1011 put_bridge(bridge); 1012 return; 1013 } 1014 1015 mutex_unlock(&bridge_mutex); 1016 } 1017 1018 /** 1019 * acpiphp_enable_slot - power on slot 1020 * @slot: ACPI PHP slot 1021 */ 1022 int acpiphp_enable_slot(struct acpiphp_slot *slot) 1023 { 1024 mutex_lock(&slot->crit_sect); 1025 /* configure all functions */ 1026 if (!(slot->flags & SLOT_ENABLED)) 1027 enable_slot(slot); 1028 1029 mutex_unlock(&slot->crit_sect); 1030 return 0; 1031 } 1032 1033 /** 1034 * acpiphp_disable_and_eject_slot - power off and eject slot 1035 * @slot: ACPI PHP slot 1036 */ 1037 int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) 1038 { 1039 struct acpiphp_func *func; 1040 int retval = 0; 1041 1042 mutex_lock(&slot->crit_sect); 1043 1044 /* unconfigure all functions */ 1045 disable_slot(slot); 1046 1047 list_for_each_entry(func, &slot->funcs, sibling) 1048 if (func->flags & FUNC_HAS_EJ0) { 1049 acpi_handle handle = func_to_handle(func); 1050 1051 if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) 1052 acpi_handle_err(handle, "_EJ0 failed\n"); 1053 1054 break; 1055 } 1056 1057 mutex_unlock(&slot->crit_sect); 1058 return retval; 1059 } 1060 1061 1062 /* 1063 * slot enabled: 1 1064 * slot disabled: 0 1065 */ 1066 u8 acpiphp_get_power_status(struct acpiphp_slot *slot) 1067 { 1068 return (slot->flags & SLOT_ENABLED); 1069 } 1070 1071 1072 /* 1073 * latch open: 1 1074 * latch closed: 0 1075 */ 1076 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) 1077 { 1078 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); 1079 } 1080 1081 1082 /* 1083 * adapter presence : 1 1084 * absence : 0 1085 */ 1086 u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) 1087 { 1088 return !!get_slot_status(slot); 1089 } 1090